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SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS

J. BIESNER K. H. WELGE XIE XIAO-XIANG

SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS

J. BIESNER, K. H. WELGE, XIE XIAO-XIANG
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  • Received Date:  30 October 1987
  • Published Online:  06 July 2005

SELECTIVE PHOTODISSOCIATION OF AMMONIA AT 000 AND 201 BANDS

  • 1. (1)联邦德国Bielefeld大学物理系; (2)中国科学院安徽光学精密机械研究所

Abstract: The photofragnentation dynamics of ammonia molecules following pulsed UV laser excitation of ground state to the two lowest levels ν′2 = 0 and 1 (ν2 vibrational mode) of their ?1(A"2) electronic excited state has been investigated by monitoring thetime-of-flight spectra of the nascent H-atom products. The spectra confirm recent revised estimates of the quantity D00(H-NH2) = 4.645 eV and reveals that the majority of the accompanying NH2 (X2B1) fragments are formed vibrationally unexcited, but with high levels of rotational excitation specifically concentrated about the a-inertial axis. The NH2(X) fragments resulting from photodissociation via the ν′2 = 1 level of NH3(?) carry a higher level of internal excitation and show an inverted population distribution over the N = Ka rotational levels.

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